Ok thanks, I finally managed to follow and complete all the steps problem solved

I got these errors when compiling in RPi3. How to enable c99 in cmake?

root@iAstroHub:/home/pi/INDI/libindipython# make
[ 25%] Swig source
Language subdirectory: python
Search paths:
./
/usr/include/python2.7/
/usr/include/libindi/
/usr/include/
/home/pi/INDI/swig-indi-python/
./swig_lib/python/
/usr/share/swig2.0/python/
./swig_lib/
/usr/share/swig2.0/
Preprocessing...
Starting language-specific parse...
/usr/include/libindi/baseclient.h:32: Warning 322: Redundant redeclaration of 'MAXRBUF',
/usr/include/libindi/indibase.h:10: Warning 322: previous declaration of 'MAXRBUF'.
/usr/include/libindi/basedevice.h:33: Warning 322: Redundant redeclaration of 'MAXRBUF',
/usr/include/libindi/indibase.h:10: Warning 322: previous declaration of 'MAXRBUF'.
Processing types...
C++ analysis...
/usr/include/libindi/baseclient.h:55: Warning 403: Class 'INDI::BaseClient' might be abstract, no constructors generated,
/usr/include/libindi/indibase.h:79: Warning 403: Method INDI::BaseMediator::newDevice(INDI::BaseDevice *) might not be implemented.
Generating wrappers...
[ 50%] Building CXX object CMakeFiles/_PyIndi.dir/indiclientpythonPYTHON_wrap.cxx.o
Linking CXX shared module _PyIndi.so
[ 50%] Built target _PyIndi
[ 75%] Swig source
Language subdirectory: python
Search paths:
./
/usr/include/python2.7/
/usr/include/libindi/
/usr/include/
/home/pi/INDI/swig-indi-python/
./swig_lib/python/
/usr/share/swig2.0/python/
./swig_lib/
/usr/share/swig2.0/
Preprocessing...
Starting language-specific parse...
Processing types...
C++ analysis...
Generating wrappers...
/usr/include/libindiserver.h:47: Warning 451: Setting a const char * variable may leak memory.
/usr/include/libindiserver.h:64: Warning 454: Setting a pointer/reference variable may leak memory.
[100%] Building C object CMakeFiles/_PyIndiServer.dir/indiserverpythonPYTHON_wrap.c.o
/home/pi/INDI/libindipython/indiserverpythonPYTHON_wrap.c: In function ‘Swig_var_clinfo_get’:
/home/pi/INDI/libindipython/indiserverpythonPYTHON_wrap.c:4933:5: error: ‘for’ loop initial declarations are only allowed in C99 or C11 mode
for(size_t i = 0; i < nclinfo; ++i)
^
/home/pi/INDI/libindipython/indiserverpythonPYTHON_wrap.c:4933:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
/home/pi/INDI/libindipython/indiserverpythonPYTHON_wrap.c: In function ‘Swig_var_dvrinfo_set’:
/home/pi/INDI/libindipython/indiserverpythonPYTHON_wrap.c:6136:7: error: ‘for’ loop initial declarations are only allowed in C99 or C11 mode
for (int i = 0; i < size; ++i) {
^
/home/pi/INDI/libindipython/indiserverpythonPYTHON_wrap.c: In function ‘Swig_var_dvrinfo_get’:
/home/pi/INDI/libindipython/indiserverpythonPYTHON_wrap.c:6161:5: error: ‘for’ loop initial declarations are only allowed in C99 or C11 mode
for(size_t i = 0; i < ndvrinfo; ++i)
^
CMakeFiles/_PyIndiServer.dir/build.make:62: recipe for target 'CMakeFiles/_PyIndiServer.dir/indiserverpythonPYTHON_wrap.c.o' failed
make[2]: *** [CMakeFiles/_PyIndiServer.dir/indiserverpythonPYTHON_wrap.c.o] Error 1
CMakeFiles/Makefile2:95: recipe for target 'CMakeFiles/_PyIndiServer.dir/all' failed
make[1]: *** [CMakeFiles/_PyIndiServer.dir/all] Error 2
Makefile:117: recipe for target 'all' failed
make: *** [all] Error 2

Rendering Error in layout Message/Item: array_keys(): Argument #1 ($array) must be of type array, null given. Please enable debug mode for more information.

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